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Baby Formula

Baby formula, or infant formula, is a breast milk substitute designed to feed children less than 12 months of age. Formulas are typically powders designed to be mixed with liquid for bottle-feeding. They contain all the nutrition a baby needs and may be made of cow’s milk or non-dairy alternatives.

Last Modified: December 14, 2021
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What Are the Main Types of Baby Formula?

Baby formulas come in three main types: Cow’s milk formula, soy formula and specialized formula. These formulas are available in three forms: Powder you mix with water, liquid concentrate you mix with water and formulas that don’t require mixing that come in ready-to-feed bottles.

The U.S. Food and Drug Administration regulates the contents and safe production of all infant formulas sold in the U.S., and all formulas have to contain sufficient nutrition, including iron.

Cow’s Milk-Based
These formulas make up about 80% of all formulas sold. The cow’s milk in formula is treated to make the protein more digestible, and milk sugar (lactose) is added to make it more equal to breast milk. Vegetable oil replaces the butterfat so infants can more easily digest it.
Extensively Hydrolyzed
This type of formula has protein that is broken down for easier digestion. These are less likely to trigger an allergic reaction in babies allergic to milk protein. They are typically more expensive than regular formulas.
Hypoallergenic Amino Acid-Based
This is the most hypoallergenic type of baby formula made with individual amino acids not sourced from dairy or soy. Most babies with severe food allergies can tolerate amino acid-based formulas.
Soy-based formulas use soy proteins and don’t contain lactose. These formulas may help babies that are allergic to lactose found in cow’s milk. But according to the American Academy of Pediatrics (AAP), up to half the babies allergic to milk protein are also sensitive to soy protein.
Specialized Formula
Specialized formulas are designed for babies with certain diseases or disorders. For example, premature babies require specialized formula. It’s important to follow all the guidelines and instructions for feeding because they are different from typical baby formulas. Don’t use a specialized formula without the recommendation of your pediatrician.

AAP and other experts recommend breastfeeding as the optimal way to nourish your baby. But some women might not be able to breastfeed for various reasons. Manufactured baby formula hasn’t been able to completely match breastmilk. But some brands such as Enfamil and Similac add ingredients like probiotics and Lactoferrin, a key component of breastmilk, and claim they are “close to breastmilk.”

However, parents are filing baby formula lawsuits after their premature babies developed necrotizing enterocolitis (NEC) after consuming Enfamil and Similac cow’s milk-based formulas. NEC is a potential baby formula side effect that causes intestinal inflammation which can cause tissue death and blood infections. NEC can be fatal.

Lawsuit Information
Lawsuits are being filed by parents whose children were diagnosed with necrotizing enterocolitis (NEC) after consuming cow's milk-based formula. Learn more.
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How to Choose the Best Baby Formula for Your Child

Always consult your pediatrician when it comes to choosing the best formula for your child. Most experts recommend cow’s milk formula over other types, unless a baby has a special condition. A parent’s formula choice is usually unique to the baby’s needs and your budget.

When feeding your baby, make sure to look out for signs of milk or food allergies. Symptoms include: Breathing problems, coughing, diarrhea, vomiting, hives and itchy eyes. If your baby has food allergies, you will want to opt for a formula that is hydrolyzed or amino acid-based. Your doctor can recommend a good brand.

“There is no compelling evidence that for otherwise well infants, any one formula is going to be better for any particular infant than any other available formula.”

Brand name or generic versions are similar in ingredients, but the generic version will be less expensive. Organic formulas have to follow the same baby formula standards as non-organic brands but they don’t contain GMOs and have certified organic ingredients. This means they are usually more expensive.

Most experts agree that there is no good evidence that shows which formula is best or that one formula is better than another. But CDC cautions against using homemade baby formulas or formulas purchased online from third party distributors because these formulas are not regulated by the FDA and might not be safe or nutritionally complete.

How Much Formula Should a Baby Drink?

How much formula to feed a baby is unique to each baby. The average baby should take about two and a half ounces of formula a day for every pound of body weight, according to APP. The CDC recommends feeding your baby when they are hungry and stopping when they are full.

Signs of hunger include: Putting hands in mouth, licking lips, clenching hands, showing excitement when food is around or turning toward the bottle. Signs of fullness include: Closing the mouth, turning away from the bottle, relaxing hands, pushing food away or making noises to let you know they are full.

How Much Formula and How Often to Feed Babies
AgeAmountHow Often
First Days 1 to 2 ouncesEvery 2 to 3 hours
First Weeks and MonthsBabies take what they need and stop eating when fullEvery 3 to 4 hours
Six to 12 MonthsFeed when baby shows signs of hunger. Feedings may be infant formula or solid foodsFive to six times in 24 hours

You should give a baby formula until they are about a year old, according to the CDC. After 12 months, babies can transition to solid foods and whole cow’s milk or unsweetened soy beverage.

The switch away from formula should be gradual. Parents can start replacing one formula feeding with cow’s milk and gradually decrease the formula feedings.

How Long Does Baby Formula Last?

Unopened containers of baby formula will last until the expiration date on the package. Make sure you don’t use expired baby formula. You should store unopened containers in a cool, dry place indoors.

Cronobacter is a germ that can be found in powdered infant formula. These infections may be deadly to babies. Make sure to thoroughly clean bottles and formula lids and scoops to avoid contamination.

You should use prepared baby formula within two hours. Infant formula not used within two hours can last up to 24 hours in the refrigerator. Throw away any leftover formula your baby doesn’t eat because baby saliva mixed with formula may cause bacteria to grow and cause side effects and health problems.

Opened containers of baby formula typically last about one month. Make sure to label opened formula containers with dates to prevent using old formula.

Please seek the advice of a medical professional before making health care decisions.
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